This anonymous district command centre was expanded from September 1956 and handed to the municipality in 1961 after defects delayed acceptance. The article gives an unusually detailed expansion-cost record, a blast-routing tunnel with two opposed entrances, two inner shock gates, own deep well, standby power, ventilation and telephone/radio systems. It had 30 male and 16 female sleeping places, exercises with 25–30 people for three days, and reported protection against a direct 250 kg conventional bomb (with 250–500 kg said to be needed to defeat this type). A desalination plant was added after well water proved salty. Area, levels, shell material and tunnel size are absent.

portals: count: 2 | scope: opposed entrances to the blast-routing tunnel | evidence: The article explicitly describes two entrances opposite one another. | inner_structure: Protected command facility with two inner shock-wave gates; whether the main shell is rock-cavern or buried concrete is not stated.; A line item for site blasting establishes some blasting work but not a rock-cavern volume. | other: 30 male and 16 female sleeping places (46 total).; Exercises used 25–30 people for three days.; A hygiene/washing tap was located between the last two shock-wave gates.

amount_sek: 675000 | price_year: 1956 | equivalent_sek: 9222125 | equivalent_year: 2016 | scope: planned cost of the facility expansion | note: Article-reported purchasing-power equivalent.; amount_sek: 456000 | price_year: 1956 | scope: state contribution to the expansion | note: Funding share, not total cost.; amount_sek: 875000 | price_year: 1956 | scope: lowest bid at construction start for the expansion | note: Not identified as the final outturn.; equivalent_sek: 12000000 | equivalent_year: 2016 | scope: article's approximate total equivalent | note: The text says the facility's total cost would be about SEK 12m in 2016 money, but does not provide a final original nominal outturn.; amount_sek: 48000 | price_year: 1956 | equivalent_sek: 621842 | equivalent_year: 2016 | scope: site blasting for the expansion; amount_sek: 5000 | price_year: 1956 | equivalent_sek: 64775 | equivalent_year: 2016 | scope: deep-water well drilling; amount_sek: 50000 | price_year: 1956 | equivalent_sek: 647752 | equivalent_year: 2016 | scope: electrical installation including standby power; amount_sek: 55000 | price_year: 1956 | equivalent_sek: 712528 | equivalent_year: 2016 | scope: ventilation installation; amount_sek: 10000 | price_year: 1956 | equivalent_sek: 129550 | equivalent_year: 2016 | scope: telephone and radio equipment; amount_sek: 10000 | price_year: 1956 | equivalent_sek: 129550 | equivalent_year: 2016 | scope: furniture and miscellaneous equipment

Two opposed entrances, blast-routing tunnel and two inner shock-wave gates.; Own deep-water well and later desalination plant.; Electrical installation with standby power.; Ventilation system.; Telephone exchanges and radio equipment.; Dormitories, operations/order room and a basic hygiene/washing point.

Structural branch: buried reinforced concrete versus rock-emplaced construction.; Two entrance interfaces and blast-routing tunnel.; Protected power, ventilation, water/well/desalination and communications.; Habitability and command fit-out for a 46-bed/25–30-person operating pattern.

All monetary figures refer to one facility's 1956 expansion, not necessarily its original pre-expansion construction or a national program. Line items are subsets of the expansion budget.

Indeterminate

Original and post-expansion floor plans and area.; Shell material, thickness, depth/cover and number of levels.; Tunnel length/cross-section and excavation quantity.; Final 1956–61 outturn and precise scope of each line item.; Generator, ventilation, well/desalination and sanitary capacities.; Protection and autonomy performance brief.

Do not confuse this 1956 expansion article with source_order 39, which has the same Swedish title but describes a distinct 1982–83 type-F facility.; The article's approximate SEK 12m in 2016 money is not construction-index escalation and should remain separate from current replacement.; Site blasting does not by itself prove a full rock cavern.; The current 500 m² / 5,382 ft² quantity is a proxy, not a reported measurement.